The sympathetic nervous system, which enables the fight-or-flight response, was thought to be present only in jawed vertebrates. Analysis of a jawless vertebrate suggests that this system might be a ...
v. 1. Propaedeutics to comparative neurology.--v. 2. Invertebrates and origin of vertebrates.--v. 3, pt. 1. Structural elements: biology of nervous tissue.--v. 3, pt ...
THIS interesting monograph appears in Dr. J. W. Spengel's “Ergebnisse und Fortschritte der Zoologie.” It gives an excellent account of the structure and mechanism of the central nervous system founded ...
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